FAQs

Frequently Asked Questions

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How much does a helical pile/anchor cost?

Cost depends on each project, but the cost of helical piles and anchors is very competitive with other types of foundation and anchor systems. In many cases they may be more economical, especially when the cost of the actual foundation/anchor element and the cost of installation are combined. Since no special equipment needs to be mobilized, like a crane and pile hammer, the installation cost is more competitive than other types of foundations. Also, scheduling of installation is easy and site disruption is minimal so that the entire project schedule can move quickly. A cost analysis for foundation comparisons should be made in units of Rands per ton of load capacity.

Why do you put helical piles under an existing foundation?

Helical Piers are used to underpin homes that are sinking, saving the home from additional structural damage. When used in combination with our Tru-lift system, homes can be secured to prevent further settling or raised up to the proper height.

What are the most popular applications for helical piles?

Helical Piles can be used on most structures in new construction or repair, and in 80-90% of soil conditions that exist. However, they are typically used in complex soil conditions or limited access situations that have prohibited the use of other traditional foundation systems.

Are there any helical pile spacing requirements?

Yes – helical piles observe the same minimum horizontal spacing requirements that other end-bearing deep foundation elements observe. The industry standard is typically 3 x diameter as measured from center to center. We typically use the largest helical plate, so for a lead section with a 30cm helix configuration, the minimum spacing should be 3 x 30cm = 900cm center to center. The helical pile minimum spacing is only important at bearing depth where the helical plates are founded, so if you have multiple piles under a pile cap and you want to minimize the area of the pile cap, the piles are typically installed at a batter (angle) to get the minimum spacing required at bearing depth and the piles can be terminated in a smaller footing.

What is the load capacity of Screw-Piles and Helical Anchors?

The maximum load capacity of Screw-Piles and Helical Anchors is the lesser of the structural capacity of the steel section, the structural capacity of the connections between any shaft extensions, and the capacity of the soil. The load capacity available from the soil depends on soil strength and the geometry of the Screw-Pile or Helical Anchor, including size, type and length of the shaft, and the number, size and spacing of the helical plates. Usually, the strength of the soil controls load capacity.

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